FC4 and development Extra repos don't work with up2date (missing headers dir)

[Hans de Goede <j w r degoede hhs nl>]

Hi,

Because the FC4/i386 and development/i386 directories under extras don't 
have an headers dir like the FC3/i386 has they don't work with up2date.

I think this should be fixed for now by adding header dirs to these 
repos. In the future up2date should learn how to handle the new repodata 
format.

Regards,

Hans